According to the passage, what happened about 400 million years ago?
A.New life-forms on land developed at a rapid rate.
B.The mega fossils were destroyed by floods.
C.Life began to develop in the ancient seas.
D.Many terrestrial life-forms died out.
A.New life-forms on land developed at a rapid rate.
B.The mega fossils were destroyed by floods.
C.Life began to develop in the ancient seas.
D.Many terrestrial life-forms died out.
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Hóa Học lớp 12
